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Individual changes in zooplankton pigmentation in relation to ultraviolet radiation and predator cues
Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science. (Zooplankton Ecology)
Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.ORCID iD: 0000-0002-1426-0036
Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science. (Zooplankton Ecology)ORCID iD: 0000-0002-3740-5998
2016 (English)In: Limnology and Oceanography, ISSN 0024-3590, E-ISSN 1939-5590, Vol. 61, no 4, 1337-1344 p.Article in journal (Refereed) Published
Abstract [en]

Copepods are common crustaceans in aquatic systems and one of the most important producers of carotenoidastaxanthin pigments, which can enhance the animals’ resistance against potentially damaging ultraviolet radiation (UVR), but at the same time, increases the risk of fish predation. Previous studies have demonstrated that copepods have different pigmentation levels matching the current threat level in terms of UVR and fish occurrence. However, these other studies have quantified population-levels changes in pigmentation, making it difficult to disentangle the role of individual phenotypic colour changes from that of selection.We quantified carotenoid-based pigmentation with colorimetric methods, which enabled us to track changes within individual copepods. Two species of copepods, Diaptomus castor and Eudiaptomus gracilis, were exposed to high and low UVR and fish cues in a factorial design. L*a*b* colour values (CIE; CommissionInternational de l’Eclairage) were extracted from digital photographs of each copepod and used as proxies for carotenoid concentration. Our results showed that individual copepods significantly changed their pigmentation in response to both UVR and fish cues within a period of 2 weeks. However, the responses differed between sexes and between adults and juveniles. UVR effects were present in all life-stages whereas fish effects were only detected in juveniles, with largest responses in D. castor. This confirms that carotenoid pigmentation is a phenotypically plastic trait, and highlights that strategies for trading off risks of UVR and predation differ between males and females as well as between life-stages.

Place, publisher, year, edition, pages
2016. Vol. 61, no 4, 1337-1344 p.
National Category
Ecology
Research subject
Ecology, Aquatic Ecology
Identifiers
URN: urn:nbn:se:lnu:diva-51844DOI: 10.1002/lno.10303ISI: 000383622900014Scopus ID: 2-s2.0-84969915314OAI: oai:DiVA.org:lnu-51844DiVA: diva2:916131
Available from: 2016-04-01 Created: 2016-04-01 Last updated: 2017-02-16Bibliographically approved

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Brüsin, MartinSvensson, P. AndreasHylander, Samuel
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